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tvp5158在运行一段时间后没有时钟信号

Other Parts Discussed in Thread: TVP5158

您好,请教一下

在给DM8168两路视频数据1080P和640x480逐行,在正常运行一段时间后640x480就没数据了,1080P还是正常的。

用示波器看了一下640x480的解码芯片TVP5158没有时钟信号输出但是TVP5158的寄存器可以正常的读写,晶振有数据,这会是什么原因导致的?